CN220526973U - Cylindrical battery - Google Patents
Cylindrical battery Download PDFInfo
- Publication number
- CN220526973U CN220526973U CN202321820886.5U CN202321820886U CN220526973U CN 220526973 U CN220526973 U CN 220526973U CN 202321820886 U CN202321820886 U CN 202321820886U CN 220526973 U CN220526973 U CN 220526973U
- Authority
- CN
- China
- Prior art keywords
- pole
- assembly
- negative electrode
- liquid injection
- battery cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 210000004027 cell Anatomy 0.000 claims description 36
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 210000005056 cell body Anatomy 0.000 claims description 6
- 239000000306 component Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000008358 core component Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a cylindrical battery, which is sequentially provided with a battery core component, a pole column component and a bottom cover component in a shell. The aluminum pole is positioned at the positive electrode end of the battery cell assembly, the pole assembly and the bottom cover assembly are assembled, positive electrode liquid injection can be carried out through a liquid injection hole of the aluminum pole, and a relatively flat negative electrode cover plate provides a supporting function. Compared with the negative electrode liquid injection, the negative electrode liquid injection device has the effect of saving cost. In the embodiment, the rivet is used for sealing the liquid injection hole, and the cylindrical battery can be assembled and processed according to the processes of pole column assembly, negative electrode sealing, positive electrode liquid injection and positive electrode rivet sealing, so that a laser sealing mode is eliminated. Compared with the conventional welding after liquid injection, the method can reduce splashing generated by laser welding after liquid injection, and increases and reduces the requirement on battery cleaning. The solution disclosed in the embodiment can be injected into the anode and sealed by rivets, so that the conventional production process can be greatly simplified; the embodiment has simple structure and better volume capacity.
Description
Technical Field
The utility model relates to the field of power batteries, in particular to a cylindrical battery.
Background
The cylindrical battery is an important new energy power supply element, and has huge market demands. Common models of cylindrical batteries include 18650, 21700, 4680, with 4680 having the most advanced performance. As a new technology, large battery enterprises are seeking technological breakthroughs to produce cylindrical batteries in a productive manner.
In the prior art, 4680 is mainly prepared by injecting liquid from the cathode of the battery, installing a cover plate on the cathode of the battery after the liquid injection is finished, and sealing by adopting a laser sealing or sealing nail sealing mode. Because the structure of the cylindrical battery needs to be provided with a pole column at the positive electrode of the battery, and the pole column needs to protrude out of the positive end face of the shell, the equipment cost can be increased when the liquid is injected into the negative electrode. The negative electrode is sealed by a cover plate, electrolyte is easy to remain after liquid injection, and the battery is corroded. Meanwhile, when welding slag splashes to cause short circuit of the anode and the cathode, or the diaphragm is pierced to influence the mosaic and insertion of cathode and anode ions, the cathode is easy to form dendrite to generate capacity loss or short circuit, and the serious condition can cause the increase of the internal pressure of the battery to generate explosion. The scheme of sealing the cathode by the sealing nails has complex process and needs to clean up residual electrolyte.
In view of the above prior art, it is necessary to improve the structure of the cylindrical battery to simplify the production process of the battery and make the cylindrical battery possible for mass production.
Disclosure of Invention
The utility model aims to provide a cylindrical battery, which comprises a shell and a battery cell assembly arranged in the shell;
the positive electrode end of the battery cell assembly is connected with a pole column assembly, and the negative electrode end of the battery cell assembly is provided with a bottom cover assembly;
the bottom cover assembly comprises a negative electrode cover plate, and the negative electrode cover plate is connected with the negative end of the shell in a sealing manner;
the pole assembly comprises an aluminum pole, and a liquid injection hole is formed in the aluminum pole; the aluminum pole is electrically connected to the positive electrode end of the battery cell assembly, and one end of the aluminum pole protrudes out of the surface of the shell.
Further, the liquid injection hole is provided with a rivet for sealing the liquid injection hole.
Further, the battery core component, the shell, the pole component, the bottom cover component, the aluminum pole and the liquid injection hole are all coaxially arranged.
Further, the pole assembly further comprises a pole insulating sheet and a positive electrode insulating sheet, and the pole insulating sheet is sleeved on the outer side of the aluminum pole;
the positive electrode insulating sheet is sleeved on the outer side of the pole insulating sheet and covers the positive electrode end face of the battery cell assembly.
Further, an annular groove is formed in the outer circumference of the aluminum pole, and the pole insulation sheet is clamped in the annular groove.
Further, the battery cell assembly comprises a battery cell body, and a positive current collecting disc and a negative current collecting disc which are arranged at two ends of the battery cell body, wherein the positive current collecting disc and the negative current collecting disc are connected with a positive electrode lug and a negative electrode lug of the battery cell body in a welding mode, and the rivet is in through connection with the aluminum electrode column and the positive current collecting disc.
Further, the battery cell assembly also comprises a high-temperature adhesive tape, wherein the high-temperature adhesive tape is positioned outside the positive electrode end of the battery cell assembly.
Further, an annular clamping groove is formed in the inner side of the negative electrode end of the shell, and the outer edge of the bottom cover assembly is clamped in the annular clamping groove.
Further, the bottom cover assembly further comprises a negative electrode insulating sheet, and the negative electrode insulating sheet covers the negative electrode end face of the cell assembly; and a limit strip facing the negative end is arranged on the outer side of the circumference of the negative current collecting disc so as to assist in positioning the position of the negative electrode insulating sheet.
Further, explosion-proof patterns are arranged on the end face of the negative electrode cover plate.
The utility model discloses a cylindrical battery, which is sequentially provided with a battery core component, a pole column component and a bottom cover component in a shell. The aluminum pole is positioned at the positive electrode end of the battery cell assembly, the pole assembly and the bottom cover assembly are assembled, positive electrode liquid injection can be carried out through a liquid injection hole of the aluminum pole, and a relatively flat negative electrode cover plate provides a supporting function. Compared with the negative electrode liquid injection, the negative electrode liquid injection device has the effect of saving cost.
In the embodiment, the rivet is used for sealing the liquid injection hole, and the cylindrical battery can be assembled and processed according to the processes of pole column assembly, negative electrode sealing, positive electrode liquid injection and positive electrode rivet sealing, so that a laser sealing mode is eliminated. Compared with the conventional welding after liquid injection, the method can reduce splashing generated by laser welding after liquid injection, and reduce the requirement on battery cleaning.
The solution disclosed in the embodiment can be injected into the anode and sealed by rivets, so that the conventional production process can be greatly simplified; the embodiment has simple structure and better volume capacity.
Drawings
Fig. 1 is a schematic view showing the appearance of a cylindrical battery according to the present utility model;
FIG. 2 is a schematic view of a cylindrical battery according to the present utility model;
FIG. 3 is a schematic structural view of an aluminum pole;
FIG. 4 is an exploded view of a cylindrical battery according to the present utility model;
FIG. 5 is a schematic structural view of the housing;
fig. 6 is a schematic view of an explosion proof pattern on the negative electrode cap plate.
Detailed Description
A cylindrical battery as shown in fig. 1 to 4 includes a housing 1 and a cell assembly 2 disposed in the housing 1. The upward direction in fig. 1 is taken as the positive terminal and the upper terminal, and the downward direction of the cell assembly 2 is taken as the negative terminal and the lower terminal. The positive electrode end of the battery cell assembly 2 is connected with a pole column assembly 3, the negative electrode end of the battery cell assembly 2 is provided with a bottom cover assembly 4, the bottom cover assembly 4 comprises a negative electrode cover plate 41, and the negative electrode cover plate 41 is in sealing connection with the negative electrode end of the shell 1; the pole assembly 3 comprises an aluminum pole 31, and a liquid injection hole 32 is formed in the aluminum pole 31; the aluminum pole 31 is electrically connected to the positive terminal of the battery cell assembly 2, and one end of the aluminum pole 31 protrudes out of the surface of the housing 1. In this embodiment, the cell assembly 2, the housing 1, the pole assembly 3, the bottom cover assembly 4, the aluminum pole 31 and the liquid injection hole 32 are all coaxially disposed.
The pole assembly 3 further comprises a pole insulating sheet 33 and a positive insulating sheet 34, and the pole insulating sheet 33 is sleeved on the outer side of the aluminum pole 31; an annular groove 35 is arranged on the outer circumference of the aluminum pole 31, and the pole insulating sheet 33 is clamped in the annular groove 35 so as to keep the pole insulating sheet 33 stable; the positive electrode insulating sheet 34 is sleeved on the outer side of the pole insulating sheet 33 and covers the positive electrode end face of the battery cell assembly 2. The positive electrode insulating sheet 34 can prevent electrolyte at the positive electrode end of the battery cell assembly 2 from overflowing, and ensures the safety of the positive electrode of the cylindrical battery during working.
In this embodiment, the cylindrical battery is divided into three parts, namely, a battery cell assembly 2, a pole assembly 3 and a bottom cover assembly 4, wherein the pole assembly 3 and the bottom cover assembly 4 are respectively positioned at the positive end and the negative end of the battery cell assembly 2, and an aluminum pole 31 protrudes out of the surface of the housing 1. Because the end face of the negative electrode cover plate 41 is generally flat, the negative electrode cover plate 41 can be used for providing support in the assembly process of the cylindrical battery, and then the liquid injection is carried out from the positive electrode end of the shell 1; after the liquid injection is completed, the liquid injection hole 32 of the aluminum pole 31 is closed, and the battery can be assembled.
In this embodiment, the rivet 5 is provided on the liquid injection hole 32, and the liquid injection hole 32 is sealed by means of positive electrode rivet. Compared with the conventional laser sealing mode, the laser sealing device has the advantages of safety and environmental protection.
Specifically, the battery core assembly 2 includes a battery core body 21, and a positive current collecting disc 22 and a negative current collecting disc 23 disposed at two ends of the battery core body 21, wherein the positive current collecting disc 22 and the negative current collecting disc 23 are connected with a positive electrode tab and a negative electrode tab of the battery core body 21 in a welding manner, and the rivet 5 is in through connection with the aluminum electrode column 31 and the positive current collecting disc 22 so as to keep communication between the aluminum electrode column 31 and the positive current collecting disc 22. The battery cell also comprises a high-temperature adhesive tape 24, wherein the high-temperature adhesive tape 24 is positioned outside the positive electrode end of the battery cell assembly 2, and is used for protecting the positive electrode of the cylindrical battery from high-temperature working environment.
As shown in fig. 4 to 6, the bottom cover assembly 4 further includes a negative electrode insulating sheet 42, and the negative electrode insulating sheet 42 covers the negative electrode end face of the cell assembly 2; the inner side of the negative electrode end of the shell 1 is provided with an annular clamping groove 11 through a rolling groove process, and the outer edge of the bottom cover assembly 4 is clamped in the annular clamping groove 11 to fix the position of the negative electrode insulating sheet 42; the circumferential outer side of the negative current collecting plate 23 is provided with a limit bar 25 toward the negative end to assist in positioning the position of the negative electrode insulating sheet 42. Further, the end face of the negative electrode cover plate 41 is provided with an explosion-proof line 43 to act as an explosion-proof valve, and when the high-temperature gas in the cylindrical battery expands, the weak area on the negative electrode cover plate 41 is broken first, so that the gas pressure in the cylindrical battery is relieved.
The preparation process of the cylindrical battery disclosed in the embodiment is as follows: the positive electrode aluminum pole 31, the pole insulating sheet 33 and the positive electrode insulating sheet 34 are combined to form a pole assembly 3, and the aluminum pole 31 is arranged into the positive electrode of the shell 1 in a punching and riveting mode; welding the positive current collecting disc 22 and the negative current collecting disc 23 on two sides of the battery cell to form a battery cell assembly 2, loading the battery cell assembly 2 from the negative electrode end of the shell 1, and connecting the lower end of the shell 1 with the negative current collecting disc 23 in a penetration welding mode; the negative electrode cap plate 41 and the negative electrode insulating sheet 42 are combined into the bottom cap assembly 4 and the bottom cap assembly 4 is fitted into the negative electrode end of the case 1 by a channeling process, so that the bottom cap assembly 4 seals and fixes the negative electrode end of the case 1. At this time, the pole is positioned in the positioning hole, and the liquid injection hole 32 on the pole can be used for injecting liquid from the positive electrode of the pole; after the liquid injection is finished, the rivet 5 is used for sealing the positive liquid injection hole 32, and the assembly of the cylindrical battery is completed.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (10)
1. A cylindrical battery comprises a shell and a battery cell assembly arranged in the shell; the method is characterized in that:
the positive electrode end of the battery cell assembly is connected with a pole column assembly, and the negative electrode end of the battery cell assembly is provided with a bottom cover assembly;
the bottom cover assembly comprises a negative electrode cover plate, and the negative electrode cover plate is connected with the negative end of the shell in a sealing manner;
the pole assembly comprises an aluminum pole, and a liquid injection hole is formed in the aluminum pole; the aluminum pole is electrically connected to the positive electrode end of the battery cell assembly, and one end of the aluminum pole protrudes out of the surface of the shell.
2. A cylindrical battery as in claim 1, wherein: and rivets for sealing the liquid injection holes are arranged on the liquid injection holes.
3. A cylindrical battery as claimed in claim 2, wherein: the battery cell assembly, the shell, the pole assembly, the bottom cover assembly, the aluminum pole and the liquid injection hole are all coaxially arranged.
4. A cylindrical battery as claimed in claim 2, wherein: the pole assembly further comprises a pole insulating sheet and a positive electrode insulating sheet, and the pole insulating sheet is sleeved on the outer side of the aluminum pole;
the positive electrode insulating sheet is sleeved on the outer side of the pole insulating sheet and covers the positive electrode end face of the battery cell assembly.
5. A cylindrical battery according to claim 4, wherein: the outer circumference of the aluminum pole is provided with an annular groove, and the pole insulating sheet is clamped in the annular groove.
6. A cylindrical battery as claimed in claim 2, wherein: the battery cell assembly comprises a battery cell body, and a positive current collecting disc and a negative current collecting disc which are arranged at two ends of the battery cell body, wherein the positive current collecting disc and the negative current collecting disc are connected with a positive electrode lug and a negative electrode lug of the battery cell body in a welding mode, and the rivet is in through connection with the aluminum electrode column and the positive current collecting disc.
7. A cylindrical battery according to claim 6, wherein: the battery cell module further comprises a high-temperature adhesive tape, wherein the high-temperature adhesive tape is positioned outside the positive electrode end of the battery cell module.
8. A cylindrical battery according to claim 6, wherein: an annular clamping groove is formed in the inner side of the negative electrode end of the shell, and the outer edge of the bottom cover assembly is clamped in the annular clamping groove.
9. A cylindrical battery as in claim 8, wherein: the bottom cover assembly further comprises a negative electrode insulating sheet, and the negative electrode insulating sheet covers the negative electrode end face of the battery cell assembly; and a limit strip facing the negative end is arranged on the outer side of the circumference of the negative current collecting disc so as to assist in positioning the position of the negative electrode insulating sheet.
10. A cylindrical battery as in claim 8, wherein: and the end face of the negative electrode cover plate is provided with explosion-proof patterns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321820886.5U CN220526973U (en) | 2023-07-12 | 2023-07-12 | Cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321820886.5U CN220526973U (en) | 2023-07-12 | 2023-07-12 | Cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220526973U true CN220526973U (en) | 2024-02-23 |
Family
ID=89925394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321820886.5U Active CN220526973U (en) | 2023-07-12 | 2023-07-12 | Cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220526973U (en) |
-
2023
- 2023-07-12 CN CN202321820886.5U patent/CN220526973U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |